I'm 35. Am I insane for wanting to start a PhD?pic related
Add more info, nigger, what do you think we are? People can start PhDs at any age if they are really interested or motivated by a topic. Given your ability to convey context and useful information, you're probably not very smart or socially apt either, so yes, a PhD is the perfect place for you.
No you're insane for starting a dumb ass /adv/ thread with so little information that it's impossible to give you advice.